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https://api.jquery.com/category/manipulation/class-attribute/
Class Attribute | jQuery API Documentation
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https://www.w3schools.com:443/html/html_classes.asp
HTML Classes - The Class Attribute
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
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https://peps.pythondiscord.com/pep-0520/
PEP 520 – Preserving Class Attribute Definition Order | peps.pythondiscord.com
Python Enhancement Proposals (PEPs)
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